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173 Posts
Well this is dominating the puppy and telling it that it does not belong in the house. Your dog is clearly upset by you getting the puppy and damaging the social status that he has enjoyed all these years. Personally I would use a gate or crate to separate the two dogs. I would suggest that the older dog get free run of the house, and let the puppy deal with the small space. I don't have any URLs to give you, I am sorry, but it is a common problem when a new dog enters the house. A Google search should bring up many good articles.